package com.example.seckilldemo.controller;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
//import com.example.seckilldemo.config.AccessLimit;
import com.example.seckilldemo.exception.GlobalException;
import com.example.seckilldemo.pojo.Order;
import com.example.seckilldemo.pojo.SeckillMessage;
import com.example.seckilldemo.pojo.SeckillOrder;
import com.example.seckilldemo.pojo.User;
import com.example.seckilldemo.rabbitmq.MQSender;
import com.example.seckilldemo.service.IGoodsService;
import com.example.seckilldemo.service.IOrderService;
import com.example.seckilldemo.service.ISeckillOrderService;
import com.example.seckilldemo.utils.JsonUtil;
import com.example.seckilldemo.vo.GoodsVo;
import com.example.seckilldemo.vo.RespBean;
import com.example.seckilldemo.vo.RespBeanEnum;
import com.sun.org.apache.bcel.internal.generic.RETURN;
import com.sun.xml.internal.ws.policy.privateutil.PolicyUtils;
import com.wf.captcha.ArithmeticCaptcha;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author bc
 */
@Slf4j
@Controller
@RequestMapping("/seckill")
public class SecKillController implements InitializingBean {
    @Autowired
    private IGoodsService goodsService;

    @Autowired
    private ISeckillOrderService seckillOrderService;

    @Autowired
    private IOrderService orderService;

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private MQSender mqSender;

    @Autowired
    private RedisScript<Long> redisScript;

    private Map<Long, Boolean> EmptyStockMap = new HashMap<>();

    //秒杀
    //windows 优化前QPS 2300.4
    //秒杀静态化之后QPS 2120
    //优化QPS 2530
    @RequestMapping("/doSeckill2")
    public String doSecKill2(Model model, User user, Long goodsId) {
        if (user == null) {
            return "Login";
        }
        model.addAttribute("user", user);
        GoodsVo goods = goodsService.findGoodsVoByGoodsId(goodsId);
        //判断库存
        if (goods.getStockCount() < 1) {
            model.addAttribute("error", RespBeanEnum.EMPTY_STOCK_ERROR.getMessage());
            return "secKillFail";
        }
        //判断是否重复抢购
//        SeckillOrder seckillOrder =
//                seckillOrderService.getOne(new QueryWrapper<SeckillOrder>().eq("user_id", user.getId()).eq("goods_id", goodsId));
        SeckillOrder seckillOrder = (SeckillOrder) redisTemplate.opsForValue().get("order:" + user.getId() + ":" + goods.getId());
        if (seckillOrder != null) {
            model.addAttribute("error", RespBeanEnum.REPEATE_ERROR.getMessage());
            return "secKillFail";
        }
        Order order = orderService.seckill(user, goods);
        model.addAttribute("order", order);
        model.addAttribute("goods", goods);
        return "orderDetail";
    }

    @RequestMapping(value = "/{path}/doSeckill", method = RequestMethod.POST)
    @ResponseBody
    public RespBean doSecKill(@PathVariable String path, User user, Long goodsId) {
        if (user == null) {
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }
        ValueOperations valueOperations = redisTemplate.opsForValue();
        boolean check = orderService.checkPath(user, goodsId, path);
        if (!check) {
            return RespBean.error(RespBeanEnum.REQUEST_ILLEGAL);
        }
        //判断是否重复抢购
        SeckillOrder seckillOrder =
                (SeckillOrder) redisTemplate.opsForValue().get("order:" + user.getId() + ":" + goodsId);
        if (seckillOrder != null) {
            return RespBean.error(RespBeanEnum.REPEATE_ERROR);
        }
        //通过内存标记，减少redis的访问
        if (EmptyStockMap.get(goodsId)) {
            return RespBean.error(RespBeanEnum.EMPTY_STOCK_ERROR);
        }
        //预减库存
//        Long stock = valueOperations.decrement("seckillGoods:" + goodsId);
        Long stock = (Long) redisTemplate.execute(redisScript, Collections.singletonList("seckillGoods:" + goodsId), Collections.EMPTY_LIST);
        if (stock < 0) {
            EmptyStockMap.put(goodsId, true);
            valueOperations.increment("seckillGoods:" + goodsId);
            return RespBean.error(RespBeanEnum.EMPTY_STOCK_ERROR);
        }
        SeckillMessage seckillMessage = new SeckillMessage(user, goodsId);
        mqSender.sendSeckillMessage(JsonUtil.object2JsonStr(seckillMessage));
        return RespBean.success(0);
//        GoodsVo goods = goodsService.findGoodsVoByGoodsId(goodsId);
//        //判断库存
//        if(goods.getStockCount() < 1) {
//            model.addAttribute("error", RespBeanEnum.EMPTY_STOCK_ERROR.getMessage());
//            return RespBean.error(RespBeanEnum.EMPTY_STOCK_ERROR);
//        }
//        //判断是否重复抢购
//        SeckillOrder seckillOrder =
//                seckillOrderService.getOne(new QueryWrapper<SeckillOrder>().eq("user_id", user.getId()).eq("goods_id", goodsId));
//        if(seckillOrder!=null) {
//            model.addAttribute("error",RespBeanEnum.REPEATE_ERROR.getMessage());
//            return RespBean.error(RespBeanEnum.REPEATE_ERROR);
//        }
//        Order order = orderService.seckill(user,goods);
//
//        return RespBean.success(order);
    }
//    @AccessLimit(second=5,maxCount=5,needLogin=true)
    @RequestMapping(value = "/path", method = RequestMethod.GET)
    @ResponseBody
//    @AccessLimit(second = 1,maxCount = 5,needLogin=true)
    public RespBean getPath(User user, Long goodsId, String captcha, HttpServletRequest request) {
        if (user == null) {
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }
        ValueOperations valueOperations = redisTemplate.opsForValue();
        //限制访问次数5秒内访问5次
        String uri = request.getRequestURI();
        captcha="0";
        Integer count = (Integer) valueOperations.get(uri+":"+user.getId());
        if(count == null){
            valueOperations.set(uri+":"+user.getId(),1,5,TimeUnit.SECONDS);
        }else if(count < 5){
            valueOperations.increment(uri+":"+user.getId());
        }else{
            return RespBean.error(RespBeanEnum.ACCESS_LIMIT_REAHCED);
        }
        boolean check = orderService.checkCaptcha(user,goodsId,captcha);
        if(!check){
            return RespBean.error(RespBeanEnum.ERROR_CAPTCHA);
        }
        String str = orderService.createPath(user, goodsId);
        return RespBean.success(str);
    }

    @RequestMapping(value = "/captcha", method = RequestMethod.GET)
    public void verifyCode(User user, Long goodsId, HttpServletResponse response) {
        if (user == null || goodsId < 0) {
            throw new GlobalException(RespBeanEnum.REQUEST_ILLEGAL);
        }
        //设置i请求头为输出图片的类型
        response.setContentType("image/jpg");
        response.setHeader("Pargam", "No-cache");
        response.setHeader("Cache-Control", "no-cache");
        response.setDateHeader("Expires", 0);
        //生成验证码，将结果放入Redis
        ArithmeticCaptcha captcha = new ArithmeticCaptcha(130, 32, 3);
        redisTemplate.opsForValue().set("captcha:" + user.getId() + ":" + goodsId, captcha.text(), 300, TimeUnit.SECONDS);
        try {
            captcha.out(response.getOutputStream());
        } catch (IOException e) {
            log.error("验证码生成失败",e.getMessage());
        }
    }

    //系统初始化，把商品库存数量加载到redis
    @Override
    public void afterPropertiesSet() throws Exception {
        List<GoodsVo> list = goodsService.findGoodsVo();
        if (CollectionUtils.isEmpty(list)) {
            return;
        }
        list.forEach(goodsVo -> {
            redisTemplate.opsForValue().set("seckillGoods:" + goodsVo.getId(), goodsVo.getStockCount());
            EmptyStockMap.put(goodsVo.getId(), false);
        });
    }

    //获取秒杀结果
    @RequestMapping(value = "/result", method = RequestMethod.GET)
    @ResponseBody
    public RespBean getResulter(User user, Long goodsId) {
        if (user == null) {
            return RespBean.error(RespBeanEnum.SESSION_ERROR);
        }
        Long orderId = seckillOrderService.getResulter(user, goodsId);
        return RespBean.success(orderId);
    }
}
